EP2089653A1 - Method and circuit arrangement for secure control of actuators, sensors and/or users in an electrical device comprising the same in particular in an electrical domestic appliance - Google Patents
Method and circuit arrangement for secure control of actuators, sensors and/or users in an electrical device comprising the same in particular in an electrical domestic applianceInfo
- Publication number
- EP2089653A1 EP2089653A1 EP07822078A EP07822078A EP2089653A1 EP 2089653 A1 EP2089653 A1 EP 2089653A1 EP 07822078 A EP07822078 A EP 07822078A EP 07822078 A EP07822078 A EP 07822078A EP 2089653 A1 EP2089653 A1 EP 2089653A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- continuous signal
- circuit arrangement
- control
- sensors
- switching elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 17
- 238000012806 monitoring device Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 3
- 239000008186 active pharmaceutical agent Substances 0.000 abstract description 20
- 238000004804 winding Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009849 deactivation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/001—Means for preventing or breaking contact-welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
Definitions
- the invention relates to a method and a circuit arrangement for safe control of actuators, sensors and / or consumers in an electrical device containing them, in particular in an electrical domestic appliance, with at least two operated according to a UN D-link switching elements for the effective activation of said actuators , Sensors or consumers by acting on the switching elements control signals.
- Such an operating condition is e.g. the safe switching off of actuators, sensors or consumers after opening a door of such a device, in particular an electrically operated washing machine or an electrically operated clothes dryer, and maintaining the off state after re-closing the door and remaining in this state, until by a user request, a renewed switching on the actuators, sensors or consumers can be allowed by sequential control.
- PECs Protected Electronic Circuit
- This known safety switching device includes a circuit arrangement in which a load is connected to a supply voltage via two switches connected in series. The one connected to one pole of a supply voltage source switch, a resistor is connected in parallel. With this resistor, an error detector is connected, which can be determined by the voltage dropping at the resistor in question, whether the two switches are working properly or if and possibly which of these two switches is working faulty, so either shorted or interrupted.
- the control device of the switch during deactivation failsafe or reliable.
- the mentioned control device comprises a sequence device which, when activated, first switches a first control signal, which is in particular a pulse signal, to the first control output, which controls the one switch which is not connected in parallel to the mentioned resistor, and a second time thereafter Control signal, which is in particular a DC signal, the second control output, that is so that controls the second switch in the sense of a closure.
- the above-mentioned load is turned off from the power supply voltage each time at least any of the two control signals is canceled; in this case, the switching path defined by the two switches is interrupted.
- the relevant switching path by control signals one of which is a pulse signal and the other is a continuous signal, and for a subsequent interruption of the switching path alone by switching off said Continuous signal, however, the relevant known safety switching device is not suitable.
- a safety circuit arrangement for controlling a safety relay of an electronically controlled brake system of a motor vehicle is known (DE 39 24 988).
- This known circuit arrangement has at least two transistors connected in series with their switching paths and a test circuit which blocks the transistors when an error or a fault occurs.
- the functionality of the transistors and the test circuit is monitored at regular intervals, e.g. every time the engine ignition of the motor vehicle is switched on. The failure of one of the transistors or the test circuit leads to the shutdown of the safety relay.
- the relevant known safety circuit arrangement is not suitable for safe switching of the mentioned switching path by control signals, one of which is a pulse signal and the other is a continuous signal, and for a subsequent interruption of the switching path alone by switching off said continuous signal, as in the relevant known safety circuit arrangement both mentioned signals are similar signals.
- the invention is therefore based on the object to show a way, as in a method and a circuit arrangement of the type mentioned in a particularly simple, yet effective way actuators and / or sensors and / or consumers can be safely controlled by switching elements characterized in that to their effective two different control signals are required and that their ineffective switching and ineffective only the elimination of a certain control signal of the two control signals leads.
- control signals a continuous signal and a pulse signal to a number of switching elements corresponding number of bistable control elements are issued, the only by the delivery of said continuous signal and by the delivery of said pulse signal during the delivery of the relevant continuous signal being brought into a switched-on state in which the switching elements are effectively switched, and brought into the switched-off state solely by switching off said continuous signal, in which the switching elements are switched off; be kept in this off state even with renewed delivery of the relevant continuous signal.
- the invention has the advantage that for the safe control of the actuators and / or sensors and / or electrical consumers of a device and in particular a domestic appliance two control signals are required, which occur independently of each other. Only by the proper delivery of the two control signals, namely the continuous signal and the pulse signal, the provided bistable control elements can be turned on and thereby switch the actuators and / or sensors and / or consumers effectively and safely by means of switching elements. To turn off the relevant actuators, sensors or consumers again effectively and safely and to leave in the off state, only the shutdown of said continuous signal is sufficient. The renewed sole delivery of the continuous signal does not then cause the bistable control elements to be switched on again.
- the conditions to be met which must be satisfied by the PECs mentioned above.
- the delivery of the pulse signal is monitored, and only when it is delivered with a duration lying below a fixed duration and at presence of said continuous signal said actuators, sensors or electrical loads are effectively switched.
- This has the advantage that in a relatively simple manner, an erroneous delivery of the pulse signal, in particular recognized as a continuous signal and can be evaluated as an accident.
- the continuous signal is monitored for its proper delivery or presence. This results in the advantage that a faulty control of the respective bistable control members can be easily detected by the mentioned continuous signal.
- output from the two bistable control elements output signals are monitored for their proper delivery.
- the relevant bistable control elements are also included in the function monitoring in an advantageous manner.
- the output of the pulse signal, the continuous signal and the output signals of the bistable switching elements is monitored in a control device, by the actuators only by proper occurrence of the pulse signal, the continuous signal and the Stahlsig- the bistable control elements , Sensors and / or consumers are effectively controlled.
- the signals in question can in fact be monitored for their correct occurrence by one and the same monitoring device.
- this circuit arrangement is characterized in that, for the control signal output, a continuous signal output device and a pulse signal output device are provided which, for a number of bistable control elements corresponding to the number of switching elements, form a permanent signal.
- bistable control elements by the delivery of said continuous signal and by the delivery of said pulse signal during the duration of the delivery of the relevant continuous signal in an on state in which the switching elements are effectively switchable, and only by Turning off said continuous signal in an off state controllable, in which the switching elements are effectively switched off, and in this turned-off state are durable even with renewed delivery of the relevant continuous signal.
- this circuit arrangement fulfills the conditions imposed on a protected electronic circuit (PEC), as mentioned above.
- the inventive U N D combination of two switching elements is in particular represented by a series connection of these switching elements.
- This series connection only has to provide the desired functionality in the sense of the required AND connection, but does not necessarily imply a spatial proximity of the two switching elements to one another. However, such a proximity may be advantageous in terms of the structural design of the corresponding circuit arrangement.
- a pulse signal monitoring device is provided by which such monitoring of the pulse signal vorappelbar that only upon delivery of a pulse signal with a duration lying below a predetermined duration and in the presence of said continuous signal, the switching elements are effectively switchable. In this way, can be in faulty pulse signal delivery In a particularly simple way to prevent the effective circuit of the mentioned switching elements.
- a continuous signal monitoring device which monitors the output from a continuous signal output device continuous signal to its proper delivery. Through this monitoring of the continuous signal output, the safety of the effective switching of the mentioned switching elements is increased even further in an advantageous manner.
- the bistable control elements are connected on the output side to a monitoring device which monitors the output of the respective output by the relevant control elements output signals.
- the bistable control elements are advantageously included in the signal monitoring, so that the effective control of the aforementioned switching elements can only take place when the bistable control elements deliver proper output signals.
- the above-mentioned monitoring devices are contained in a common control device, which preferably contains or is formed by a microcomputer or microcontroller with associated software.
- a common control device which preferably contains or is formed by a microcomputer or microcontroller with associated software. This has the advantage of a particularly low circuit complexity for the monitoring devices with it.
- the continuous signal output device is formed by a door switch contact of the mentioned electrical device
- the pulse signal output device is formed by a button which is actuated independently of the door switch contact.
- the electrical actuators and / or sensors and / or consumers are connected with the inclusion of said switching elements to a relay circuit which can be controlled by a control device, which is preferably the aforementioned control device.
- a control device which is preferably the aforementioned control device.
- This measure has the advantage of a simple electrical isolation of the electrical actuators and / or sensors and / or Consumer of the switching devices and the control device with it.
- Such a galvanic isolation is often desirable or necessary for safety reasons, because between the normally operated with a relatively high AC line voltage of eg 230V actuators, sensors or consumers must not have an electrically conductive connection with their drive circuits with relatively low voltage of eg + 5V are operated.
- each electrical actuator, sensor and / or consumer a separate relay associated. This results in the advantage of a particularly simple control of the respective electrical actuators, sensors and / or consumers.
- the switching elements are connected to the supply circuits of the electrical actuators and / or sensors and / or consumers associated relay common.
- the switching elements with contacts of the electrical actuators, sensors and / or consumers associated relay are connected together and arranged with these contacts in supply circuits of the relevant electrical actuators, sensors and / or consumers.
- the bistable control elements are preferably each formed by a bistable circuit element, such as a bistable flip-flop or bistable electronic component. This has the advantage of a particularly low circuit complexity with regard to the realization of the bistable control elements with it.
- the bistable control elements are each constructed from semiconductor elements.
- the switching elements are preferably formed by semiconductor elements. This results in the advantage of bistable control elements and switching elements that are particularly easy to set up. Based on embodiments, the invention is explained below with reference to drawings.
- FIG. 1 schematically shows in a circuit diagram a basic structure of a circuit arrangement according to a first embodiment of the invention
- FIG. 2 shows schematically in a circuit diagram a modification of the circuit arrangement shown in FIG. 1 according to a second embodiment of the invention
- FIG. 1 schematically shows in a circuit diagram a basic structure of a circuit arrangement according to a first embodiment of the invention
- FIG. 2 shows schematically in a circuit diagram a modification of the circuit arrangement shown in FIG. 1 according to a second embodiment of the invention
- FIG. 1 schematically shows in a circuit diagram a basic structure of a circuit arrangement according to a first embodiment of the invention
- FIG. 2 shows schematically in a circuit diagram a modification of the circuit arrangement shown in FIG. 1 according to a second embodiment of the invention
- Fig. 3 shows schematically in a circuit diagram a possible construction of a bistable control element, as it is used in the circuit arrangements according to FIGS. 1 and 2, and
- Fig. 4 shows schematically in a circuit diagram another possible structure of a bistable control member, as provided in the circuit arrangements according to FIGS. 1 and 2.
- the circuit arrangement shown in Fig. 1 is used for safe control of electrical actuators and / or sensors and / or consumers, which are designated in Fig. 1 with V1, V2 and V3.
- the actuators can be, for example, contactors, reversing relays, etc. in electrical appliances, in particular in electrical household appliances.
- the mentioned electrical sensors may be, for example, temperature sensors, fill level or water level sensors, etc., as are provided in particular in electrically operated domestic appliances.
- the electrical consumers mentioned may be, for example, electric motors, heating resistors, etc., as are likewise contained in electrically operated domestic appliances.
- the above-mentioned electrical actuators and / or sensors and / or consumers V1, V2, V3 will, as will be seen in more detail below, be replaced by less than at least two switching elements SW1 and SW2 operated in accordance with an AND operation are activated by means of control signals acting on the switching elements SW1 and SW2.
- the two switching elements SW1 and SW2 which may be formed for example by semiconductor switches, are connected in series with their switching paths.
- the switching element SW1 of the relevant series circuit is connected with its one switching path connection to the one ends of relay windings RW1, RW2 and RW3 of electromagnetic relays, which are provided individually for the respective actuator or sensor or consumer V1, V2, V3.
- Each of the relay windings RW1, RW2 and RW3 is associated with a normally open contact K1, K2 or K3, via which the respective one end of the respective electrical actuator, sensor or load V1, V2, V3 is connected to a common node N, the For example, can cause a 50 Hz AC line voltage of 230V.
- the other ends of the electrical actuators, sensors and / or consumers V1, V2, V3 are in the present case, for example, to ground or ground potential.
- the aforementioned relay windings RW1, RW2, RW3 are connected with their other, not yet mentioned ends to the output side of a relay driver RE not shown here in its construction.
- This relay driver RE can be formed, for example, by individual control transistors, whose switching paths are individually connected to the mentioned relay windings RW1, RW2 and RW3 and whose control electrodes are connected together to an indicated in Fig. 1 input of the relay driver RE.
- the respective input of the relay driver RE is connected to an output EA3 of a control device ST, which will be discussed in more detail below.
- the aforementioned control transistors may be connected with their switching path electrodes which are not connected to the relay windings RW1, RW2 and RWS3, for example, at a circuit point leading to a DC voltage of + 5V.
- the switching element SW2 of the series circuit consisting of the two switching elements SW1 and SW2 is connected with its one switching path terminal to one terminal of a permanent signal output device representing contact TK, whose other terminal is grounded ,
- This contact TK can be, for example, a door contact of an electrically operating washing machine or an electrically operated tumble dryer, which is closed when the door is closed and in this case a continuous signal (earth or ground). Potential).
- This continuous signal DS then lies in FIG. 1 at the lower end of the switching element SW2; It can only then energize the previously considered relay coils RW1, RW2 and RW3, when the two actuated according to a UN D-link interconnected switching elements SW1 and SW2, so are closed. However, this is not the case at this time.
- the switching elements SW1 and SW2 are connected with their operating inputs to outputs AS1 and AS2 of two bistable control elements SG1 and SG2, respectively.
- These bistable control elements SG1 and SG2 are generally provided in a number corresponding to the number of switching elements SW1, SW2. This number is, as mentioned above, at least two, and here it is two.
- the bistable control elements SG1 and SG2 shown in FIG. 1 each have two control inputs on the input side.
- the bistable control element SG1 has the two control inputs E1 1 and E21
- the bistable control element SG2 has the two control inputs E12 and E22.
- the two control inputs E21 and E22 of the two bistable control elements SG1 and SG2 are connected to the previously mentioned, forming a continuous signal output device door contact TK of the electrical device, in which the entire circuit arrangement is used.
- the other two control inputs E1 1 and E12 of the two bistable control elements SG1 and SG2 are connected to a pulse signal output device TA, which is formed according to FIG.
- a pushbutton TA via which the relevant control inputs E11 and E12 of the two bistable control elements SG1 and SG2 are connected to a node U, which may carry a voltage of, for example, + 2.7V.
- the relevant button TA is independent of the aforementioned door contact TK operable and of course also arranged separately from the door contact.
- a pulse signal IS is output in the form of a single voltage pulse of, for example, + 2.7V.
- this pulse signal is a single pulse which, when the button TA is working properly, has a certain duration, which is below a defined duration.
- the above-mentioned pulse signal IS on its operation towards issuing pushbutton TA and the mentioned continuous signal DS in its closed state donating door contact TK are connected to input terminals EA1 and EA2 of the aforementioned control device ST connected, which may be, for example, a microcontroller with its own software.
- the pulse signal IS and the continuous signal DS are monitored for their proper occurrence. With respect to the pulse signal IS is monitored whether this occurs with a duration lying below a predetermined duration, and with respect to the continuous signal DS is monitored whether this ever occurs.
- By monitoring the pulse signal IS can thus be determined whether the button TA is working properly or whether he delivers as a result of an error at all no pulse signal IS or a continuous signal, for example due to a so-called sticking.
- the previously considered control device ST has two more input terminals, which are designated RK1 and RK2. Of these input terminals, the input terminal RK1 is connected to an output terminal AS1 of the bistable control element SG1, which is connected to the operation input of the above-mentioned switching element SW1. The other input terminal RK2 of the control device ST is connected to an output terminal AS2 of the bistable control element SG2, which is connected to the operating input of the switching element SW2.
- the connections between the output terminal AS1 of the bistable control element SG1 and the output terminal AS2 of the bistable control element SG2 with the aforementioned input terminals RK1 and RK2 of the control device ST represent so-called return channel connections, via which in the control device ST the occurrence of output signals at the mentioned Output terminals AS1 and AS2 of the two bistable control elements SG1 and SG2 is monitored.
- This monitoring takes place as the monitoring of the occurring at the input terminals EA1 and EA2 of the control device ST signals by parts of the control device ST forming monitoring devices.
- these monitoring devices can be implemented in software in the control device ST formed in particular by a microcontroller with its own software.
- the bistable control elements SG1 and SG2 and the control device ST are subjected to a pulse signal IS, which, however, has no further effects.
- the illustrated circuit arrangement remains in its previously mentioned rest or initial state. Even if only the door contact TK is initially closed and remains closed, the rest or output state of the circuit arrangement shown in FIG. 1 remains unchanged. However, if the button TA is additionally actuated when the door contact TK is closed - which thus acts as a start button - and thus a pulse signal IS is output, the two bistable control elements SG1 and SG2 reach their respective on or set state. Incidentally, a renewed one or more additional actuation of the pushbutton TA no longer has any effect on the state of the bistable control elements SG1 and SG2 achieved in this way.
- the two bistable control elements SG1 and SG2 output from their output terminals AS1 and AS2 respectively such an output signal, such as a binary signal "1" corresponding output signal of eg + 2.7V from that with their respective output terminal
- the ends of the relay windings RW1, RW2 and RW3 of the relay circuit connected to the series connection of the switching elements SW1 and SW2 receive ground potential from the closed door contact TK and reach their energizing state, provided that the relay driver RE input side of the output terminal EA3 of the control device ST is supplied to the proper state of the monitored signals indicating control signal (for example, a binary signal "1").
- the associated relay contacts K1, K2 and K3 are closed, and thus the mains voltage is applied from the node N to the electrical actuators and / or sensors and / or consumers V1, V2 and V3 , The respective actuators, sensors or consumers V1, V2, V3 are thus activated. If the door contact TK is then opened again, the delivery of the continuous signal DS, that is to say the ground or ground potential, stops via this door contact TK.
- a renewed actuation - whether deliberate or unintentional - of the door contact TK should not result in a renewed activation of the currently deactivated electrical actuators, sensors or consumers V1, V2 and V3, and it does not result in such a renewed activation.
- the sole delivery of the continuous signal DS through the closed door contact TK does not bring back the bistable control elements SG1 and SG2 in their switched or set state. Rather, this requires in addition the delivery of a pulse signal IS of the specified duration by the button TA to be actuated again. However, as long as this button TA is not actuated, the bistable control elements SG1 and SG2 remain in their off or reset states, and thus the electrical actuators, sensors or consumers V1, V2, V3 can not be activated.
- FIG. 2 shows a modification of the connection of the switching elements SW1, SW2 with the respective relays. Namely, the switching elements SW1, SW2 with the relay contacts K1, K2, K3 of the electrical actuators, sensors or loads V1, V2, V3 associated relay or relay windings RW1, RW2, RW3 are connected together and with these contacts in Circuits of the respective actuators, sensors or consumers V1, V2, V3 arranged. With reference to the circuit arrangement illustrated in FIG.
- bistable control elements SG1 and SG2 Two possible embodiments of the bistable control elements SG1 and SG2 provided in the circuit arrangements according to FIGS. 1 and 2 will be explained below. Since these bistable control elements SG1 and SG2 can be constructed identically in their structure and are normally of identical design, only one possible design of the bistable control element SG1 will be considered in more detail with reference to FIGS. 3 and 4.
- the bistable control element SG1 contains a bistable flip-flop KS, which is preferably a D-type bistable flip-flop, as for example given by the bistable flip-flop 74LVC1 G74.
- This bistable tilting element GS has an input or data connection D, which is connected via an inverter or a non-element NG to the input connection E21 of the bistable flip-flop SG1 and thus to the continuous signal DS according to FIGS becomes.
- the respective bistable flip-flop KS has a reset input R, which in the present case is connected to the input terminal E21 of the bistable control element SG1.
- the bistable flip-flop KS has a clock input C, which is connected to the input terminal E1 1 of the bistable control element SG1, ie with the control input to which the pulse signal IS shown in FIG. 1 and 2 is supplied.
- the bistable flip-flop KS has two outputs Q and Q, of which in the present case case the output Q is connected to the output terminal AS1 of the bistable control element SG1.
- bistable control element SG1 shown in FIG. 3 will be considered briefly below.
- the sole supply of a signal - in the present case of the pulse signal IS mentioned in connection with FIG. 1 - at the input terminal E11 and thus at the clock input C of the bistable flip-flop KS can only cause this bistable flip-flop to be connected in accordance with the voltage applied to the input terminal E21 of the bistable control element SG Input signal is set. If no ground or ground potential corresponding to a binary signal "0" - the continuous signal DS - is fed to this input terminal E21, since the door contact TK is still open in the circuit arrangement according to FIG. 1 or according to FIG.
- the reset input D becomes the bistable flip-flop KS in the bistable control element SG1 is supplied with a potential corresponding to a binary signal "1”, and a potential corresponding to a binary signal "0" is supplied to the D input of the bistable flip-flop KS in question KS is set to its reset state if it is not already in this reset state, in which case the bistable flip-flop KS outputs from its output Q an output signal corresponding to a binary signal "1" and from its output Q a binary signal "0" Output signal.
- a subsequent renewed one or more occurrences of the mentioned pulse signal IS at the input terminal E1 1 does not change the reached setting state of the bistable flip-flop KS.
- the reset input R of the bistable flip-flop KS a binary signal "1” corresponding signal is supplied, due to this bistable flip-flop KS without a pulse signal IS and thus without a clock signal arrives at its clock input C again in its reset state, in which of its output terminal ßein a binary signal "1" corresponding potential and its output terminal Q a binary signal "0” corresponding potential is given, due to which the associated switching element SW1 is opened again ,
- the embodiment of the bistable control element SG1 shown in FIG. 4 shows a replica circuit of a thyristor consisting of two mutually coupled bipolar transistors, namely a transistor T1 of the npn conductivity type and a transistor T2 of the pnp conductivity type.
- the transistor T1 is connected with its base to the collector of the transistor T2, which in turn is connected with its base to the collector of the transistor T1.
- the common connection point of the collector of the transistor T1 and the base of the transistor T2 is connected via a series RC element, consisting of an ohmic resistor R1 and a capacitor C2 to the input terminal E1 1 of the bistable control element SG1.
- the common point just mentioned between the collector of the transistor T1 and the base of the transistor T2 is connected via a resistor R2 to a + U B leading to a positive supply voltage of + 5V, for example, to which the emitter of the transistor T2 is also connected is.
- the common connection point between the base of the transistor T1 and the collector of the transistor T2 is connected to the input terminal E21 via an ohmic resistor R3 and, if appropriate, directly to the output terminal AS1 of the bistable control element SG1.
- the emitter of the transistor T1 is also connected to the input terminal E21 of the bistable control element SG1.
- This last-mentioned state of the thyristor replica circuit and thus of the switching element SW1 remains independent of the occurrence or non-occurrence of further pulse signals IS at the input terminal E11 of the bistable control element SG1 until the input terminal E21 of the bistable control element SG1 receives the continuous signal (ground or ground potential). disappears again.
- the two transistors T1 and T2 of FIG. 4 return to their non-conductive state.
- the sole supply of the continuous signal DS that is from ground or ground potential to the input terminal E21, does not cause the two transistors T1 and T2 to reenter get the conductive state.
- this circuit also meets the requirements placed on a protected electronic circuit (PEC), as mentioned above.
- bistable control elements SG1, SG2 can also be realized in a different manner than previously explained with reference to FIGS. 3 and 4.
- the respective bistable control elements SG1, SG2 can be realized, for example, by other bistable flip-flops or by normal thyristors or triacs, provided that these bistable control elements operate in the manner described above to supply a continuous signal and a pulse signal.
- RW1 RW2, RW3 relay winding
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Safety Devices In Control Systems (AREA)
- Electronic Switches (AREA)
- Selective Calling Equipment (AREA)
- Programmable Controllers (AREA)
- Relay Circuits (AREA)
- Control And Safety Of Cranes (AREA)
- Brushes (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006052739A DE102006052739A1 (en) | 2006-11-08 | 2006-11-08 | Method and circuit arrangement for the safe control of actuators, sensors and / or consumers in an electrical device containing them, in particular in an electrical domestic appliance |
PCT/EP2007/061730 WO2008055828A1 (en) | 2006-11-08 | 2007-10-31 | Method and circuit arrangement for secure control of actuators, sensors and/or users in an electrical device comprising the same in particular in an electrical domestic appliance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2089653A1 true EP2089653A1 (en) | 2009-08-19 |
EP2089653B1 EP2089653B1 (en) | 2010-09-15 |
Family
ID=39156345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07822078A Not-in-force EP2089653B1 (en) | 2006-11-08 | 2007-10-31 | Method and circuit arrangement for secure control of actuators, sensors and/or users in an electrical domestic appliance |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100145525A1 (en) |
EP (1) | EP2089653B1 (en) |
CN (1) | CN101535708B (en) |
AT (1) | ATE481599T1 (en) |
DE (2) | DE102006052739A1 (en) |
EA (1) | EA015184B1 (en) |
WO (1) | WO2008055828A1 (en) |
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EP2287686B1 (en) | 2009-07-29 | 2019-07-10 | Electrolux Home Products Corporation N.V. | Household appliance with a sensor |
DE102010011938A1 (en) * | 2010-03-18 | 2011-09-22 | Ilcon Gmbh | Control system for electric motor actuated adjusting devices and method for generating fail-safe control signals for electric motor actuated adjusting devices |
DE102010037496A1 (en) * | 2010-09-13 | 2012-03-15 | Miele & Cie. Kg | Aquiferous household apparatus i.e. dishwasher, has sensor computer for monitoring door opening sensor and for automatically shutdown opening of movable door of dishwasher during failure |
CN102024306B (en) * | 2010-10-29 | 2016-04-27 | 海尔集团公司 | A kind of detection circuit for washing machine door cover |
CN102538777B (en) * | 2010-12-31 | 2016-02-24 | 美新半导体(无锡)有限公司 | The multi-axial sensor system of low-power consumption and reduce the method for its power consumption |
FR2992001B1 (en) * | 2012-06-13 | 2015-02-06 | Fagorbrandt Sas | HOUSEHOLD APPLIANCE COMPRISING A TEMPERATURE SENSOR AND AT LEAST ONE POSITION SENSOR OF AN ELEMENT OF THE HOUSEHOLD APPLIANCE |
FR2992002B1 (en) * | 2012-06-13 | 2014-07-25 | Fagorbrandt Sas | HOUSEHOLD APPLIANCE COMPRISING A RESISTIVITY MEASURING MOISTURE SENSOR AND A WATER LEVEL SENSOR |
CN103019138B (en) * | 2012-12-07 | 2015-07-08 | 江南工业集团有限公司 | Current switching circuit |
CN103561514B (en) * | 2013-10-30 | 2015-08-12 | 广东省人民医院 | The using method of thoracic cavity Minimally Invasive Surgery lamp block, single lamp device and two lamp device and three |
EP2937745B1 (en) * | 2014-04-25 | 2016-10-05 | Sick Ag | Safety control system for safe operation of a technical installation and method for operating the safety control system |
DE102016210515A1 (en) | 2016-06-14 | 2017-12-14 | Volkswagen Aktiengesellschaft | actuator |
CN107877355B (en) * | 2017-12-19 | 2023-08-11 | 浙江大学台州研究院 | High-reliability grinding machine shutdown control device and method thereof |
WO2023154035A1 (en) * | 2022-02-08 | 2023-08-17 | Electrolux Home Products, Inc. | Isolated voltage door latch for an appliance |
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DE3924988C2 (en) * | 1989-07-28 | 2002-08-01 | Continental Teves Ag & Co Ohg | Circuit arrangement for controlling the safety relay of an electronically controlled brake system of a motor vehicle |
US5175413A (en) * | 1990-07-31 | 1992-12-29 | Whirlpool Corporation | Fail-safe relay drive system for cooking apparatus |
DE19504249C2 (en) * | 1994-03-26 | 1999-04-22 | Miele & Cie | System for controlling the heating output of an exhaust air dryer |
JP3825919B2 (en) * | 1998-06-01 | 2006-09-27 | キヤノン株式会社 | Interlock processing circuit |
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DE10156771A1 (en) * | 2001-11-19 | 2003-05-28 | Bsh Bosch Siemens Hausgeraete | Electrical domestic machine has switch-on activation period whose duration can be freely selected within defined limits using period adjustment arrangement |
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DE102004020997A1 (en) * | 2004-04-19 | 2005-11-03 | Pilz Gmbh & Co. Kg | Safety switching device for a safety circuit |
DE102005034911A1 (en) * | 2005-07-26 | 2007-02-01 | BSH Bosch und Siemens Hausgeräte GmbH | Method and circuit arrangement for the secure control of actuators, sensors or consumers in an electrical device containing them, in particular electrical domestic appliance |
-
2006
- 2006-11-08 DE DE102006052739A patent/DE102006052739A1/en not_active Withdrawn
-
2007
- 2007-10-31 US US12/513,534 patent/US20100145525A1/en not_active Abandoned
- 2007-10-31 EA EA200970448A patent/EA015184B1/en not_active IP Right Cessation
- 2007-10-31 CN CN2007800416373A patent/CN101535708B/en not_active Expired - Fee Related
- 2007-10-31 EP EP07822078A patent/EP2089653B1/en not_active Not-in-force
- 2007-10-31 WO PCT/EP2007/061730 patent/WO2008055828A1/en active Application Filing
- 2007-10-31 AT AT07822078T patent/ATE481599T1/en active
- 2007-10-31 DE DE502007005095T patent/DE502007005095D1/en active Active
Non-Patent Citations (1)
Title |
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See references of WO2008055828A1 * |
Also Published As
Publication number | Publication date |
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CN101535708B (en) | 2013-07-17 |
EA200970448A1 (en) | 2009-12-30 |
ATE481599T1 (en) | 2010-10-15 |
US20100145525A1 (en) | 2010-06-10 |
DE502007005095D1 (en) | 2010-10-28 |
CN101535708A (en) | 2009-09-16 |
EP2089653B1 (en) | 2010-09-15 |
DE102006052739A1 (en) | 2008-05-15 |
EA015184B1 (en) | 2011-06-30 |
WO2008055828A1 (en) | 2008-05-15 |
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